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117 lines
4.4 KiB
C++
117 lines
4.4 KiB
C++
/*
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* Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2014 SAP SE. All rights reserved.
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* Copyright (c) 2022, IBM Corp.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "memory/metaspace.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/javaThread.hpp"
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frame JavaThread::pd_last_frame() {
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assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
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// Only called by current thread or when the thread is suspended.
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// No memory barrier needed, here. Only writer must write sp last (for use by profiler).
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intptr_t* sp = last_Java_sp();
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address pc = _anchor.last_Java_pc();
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return frame(sp, pc);
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}
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bool JavaThread::pd_get_top_frame_for_profiling(frame* fr_addr, void* ucontext, bool isInJava) {
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// If we have a last_Java_frame, then we should use it even if
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// isInJava == true. It should be more reliable than ucontext info.
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if (has_last_Java_frame() && frame_anchor()->walkable()) {
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intptr_t* sp = last_Java_sp();
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address pc = _anchor.last_Java_pc();
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// pc can be seen as null because not all writers use store pc + release store sp.
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// Simply discard the sample in this very rare case.
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if (pc == nullptr) return false;
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*fr_addr = frame(sp, pc);
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return true;
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}
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// At this point, we don't have a last_Java_frame, so
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// we try to glean some information out of the ucontext
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// if we were running Java code when SIGPROF came in.
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if (isInJava) {
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ucontext_t* uc = (ucontext_t*) ucontext;
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address pc = (address)uc->uc_mcontext.jmp_context.iar;
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if (pc == nullptr) {
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// ucontext wasn't useful
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return false;
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}
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frame ret_frame((intptr_t*)uc->uc_mcontext.jmp_context.gpr[1/*REG_SP*/], pc);
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if (ret_frame.fp() == nullptr) {
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// The found frame does not have a valid frame pointer.
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// Bail out because this will create big trouble later on, either
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// - when using istate, calculated as (nullptr - ijava_state_size) or
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// - when using fp() directly in safe_for_sender()
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//
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// There is no conclusive description (yet) how this could happen, but it does.
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// For more details on what was observed, see thread_linux_s390.cpp
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return false;
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}
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if (ret_frame.is_interpreted_frame()) {
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frame::ijava_state *istate = ret_frame.get_ijava_state();
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const Method *m = (const Method*)(istate->method);
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if (!Method::is_valid_method(m)) return false;
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if (!Metaspace::contains(m->constMethod())) return false;
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uint64_t reg_bcp = uc->uc_mcontext.jmp_context.gpr[14/*R14_bcp*/];
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uint64_t istate_bcp = istate->bcp;
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uint64_t code_start = (uint64_t)(m->code_base());
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uint64_t code_end = (uint64_t)(m->code_base() + m->code_size());
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if (istate_bcp >= code_start && istate_bcp < code_end) {
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// we have a valid bcp, don't touch it, do nothing
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} else if (reg_bcp >= code_start && reg_bcp < code_end) {
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istate->bcp = reg_bcp;
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} else {
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return false;
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}
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}
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if (!ret_frame.safe_for_sender(this)) {
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// nothing else to try if the frame isn't good
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return false;
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}
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*fr_addr = ret_frame;
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return true;
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}
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// nothing else to try
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return false;
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}
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// Forte Analyzer AsyncGetCallTrace profiling support.
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bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava) {
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return pd_get_top_frame_for_profiling(fr_addr, ucontext, isInJava);
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}
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void JavaThread::cache_global_variables() { }
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